Significant Accounting Policies - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Significant Accounting Policies [Line Items]
Restricted cash			$ 20,000
Right-of-use assets	$ 1,780,000
Operating lease, liability	$ 1,816,000
ASU 2016-02
Significant Accounting Policies [Line Items]
Right-of-use assets		$ 2,000,000
Operating lease, liability		$ 2,000,000
Minimum
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	3 years
Maximum
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	5 years